Study On Optimal Design Method Of Automobile Synchronizer Structure Parameters

Synchronizer is a core part of mechanical transmission, and its characteristic is related to gearshift performance. In the case that the synchronizer structure type is determined, its performance is mainly determined by structure parameters. Therefore, the optimal design of synchronizer structure parameters has become a hot research topic of synchronizer development. In this paper, the single cone synchronizer of mechanical transmission is studied. The optimal design method of synchronizer structure parameters was researched with virtual prototyping technology and modern optimum design method, and the effectiveness for improving synchronizer performance was verified through the analysis and evaluation of optimization results. The following three main contents have been done in this paper:After in-deep analysis of synchronizer dynamic characteristics and working principle, the mathematical models of shift force, locking surface stress and synchronization time were established. The model of shift force was simulated with numerical way in Matlab. The simulation results show that the established model can actually reflect working process of synchronizer through the comparison of simulation result with classical shift force curve. Meanwhile, the correctness of mathematical model was verified.In order to research the influence rules of main structure parameters on synchronizer performance(synchronization time and twice impact force), the parametric model of synchronizer was established and to simulate by using the software, UG and ADAMS. The simulation test indicates that synchronization time increases with friction cone angle, decreases with friction coefficient going up, goes down with friction cone mean radius increasing. The locking angle has no effect on synchronizer time, but has a significant influence on the twice impact force.In view of the complexity of evaluation index, the optimization mathematical model was established, and different algorithms(optimization toolbox in Matlab and particle swarm optimization) are chosen to minimize synchronizer time. Then optimization result is compared and verified. Finally, a detailed evaluation system was built to improve the synchronizer life and shift smoothness, and the optimized synchronizer is evaluated through the methods theoretical calculations and dynamic simulation. The evaluation results show that, for the optimized synchronizer, not only is synchronization time obviously shorter, but also life and shifting smoothness meet the evaluation index. Therefore, the optimal design method in this paper can direct synchronizer development, and improve performance.